Two-diensional three-frequency dephase measuring method base on color structural light

Abstract

A two-dimensional three-frequency phase resolution measurement method based on colored structured light, the steps are: ① Prepare three gratings composed of two different three primary color sinusoidal lights with the same frequency; ② Project the grating onto the measured object, using two The same CCD camera was taken to obtain 24 photos; ③ Dephase the photos taken to obtain the phase values ​​in the X direction and Y direction of each pixel on each photo; ④ Match the two phase values ​​to calculate each The 3D coordinates of the point. The invention overcomes the defects of coding in only one direction and the shortcoming of low matching precision, so that the coding matching is more effective and accurate. It avoids the measurement error caused by contact deformation in the mechanical measurement method, and improves the measurement accuracy; it does not need to obtain three-dimensional information through two-dimensional scanning, which improves the measurement speed; it can record the color information of the object at the same time, so that the reverse engineering can be obtained from the three-dimensional object The acquisition of shape is further extended to the inversion of object color.

Description

technical field [0001] The invention belongs to the field of reverse engineering measurement, and in particular relates to a two-dimensional three-frequency phase resolution measurement method based on colored structured light. Background technique [0002] The binocular grating projection structured light measurement method is a relatively advanced measurement method at present. It combines the structured light method and the stereo vision method. The projected light beam is projected on the surface of the object through the grating to form structured light. The light is coded into fringe patterns. These deformed fringes are recorded by two CCD cameras at a certain angle to the center of the projector. Each spatial point in the measurement space is encoded according to a series of projected gratings recorded. After decoding and phase calculation, each spatial point is obtained. The encoded information and phase information of a spatial point can be used to determine its spa...

AI Technical Summary

Problems solved by technology

That is to say, in the traditional encoding and one-dimensional phase resolution method, the corresponding relationship of feature points in the left and right photos cannot be uniquely determined, and the corresponding relationship of feature points in the left and right photos must be uniquely determined with the help of other constraints.

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